Return the number of the week (e.g., 16 out of 52 weeks)

get-week-number.js

function getWeekNumber() {
	const now = new Date()
	const oneJan = new Date(now.getFullYear(), 0, 1)
	const numDays = Math.floor((now - oneJan) / (24 * 60 * 60 * 1000))
	return Math.ceil(( now.getDay() + 1 + numDays) / 7)
}